When submitting single crystals for structure determination, please leave the crystals in the crystallization solvent.

For powder diffraction, best results will be obtained if 0.5 ml of finely ground powder is provided. The experiment can be done with much less sample, but the resulting diffraction patterns may not be completely representative of the sample.

Film samples should be on a flat substrate no larger than 1 inch square. A square sample 1 cm on a side is ideal.